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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e955a423ea215f5c756b0c87aee185ea0a7ba900514991c6ff369495286f9a2f' 
  AND token = 'g1t7Qg1G5joJYYoWGER3d4+rDCgXAZ0y/J0Wxj3P5HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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