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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5036c9d57de8d4328202cc8532378a69d9d985325d019c64cd4b618a6b9615c1' 
  AND token = 'Ja52wJxCVq8vr8fLuWcpQowqmBlIJntsOcWlY6utU1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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