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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8178a900d456c95320f1c6657c2ae0942af32bf90e318d3ce5f277b230bc0c7' 
  AND token = 'moyA4L1kknRrLY2jcrCXszy0yiL4kVPu89pYX283zNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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