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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9897350d2dd4d80eb814ce0b2e92d4ce341eaa01d3fcd2a4fb6b3e15d241a0' 
  AND token = 'lQEj9qfV6wsITz7e1BGvZzmFAtRHcFd41nM+B5q5F9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}