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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401eb813c1b76d72c65c8599f0ae6bf7dbdb06c6aa54cfc534f89b70cf796d1b' 
  AND token = '0mYaiwvSt+eOnAah8HN2vfHEO9msvc1dLHcoEUypCmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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