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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929734bf1893a627043e14b7021efe4a10b4c0ce68ffe03da827705a2c3bccc7' 
  AND token = 'r4qYCCMPTn8TamJvM5o4377QlOwo0L6s+60ZKFoEDns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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