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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed36613fe89ac675f02a5b828f3cec984fdc0a1ebb991ee1f7abbeea4ecfa18' 
  AND token = '6YzEuJhlfqD0HkEpb6qcST0XXZJu69YQ8MsWNgAffXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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