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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74fa256e744d98e01ef31a8ee802bce96e5d416d413ce7d56b219ff78e39606b' 
  AND token = '/L6F/u0u7Eqc2jLTc7QskxomWTjWk+7Lcy4Rd4uudWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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