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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '430add841d213454628358a9a8da27886c84159f484cd5fd58a23b6b9bc0f8ad' 
  AND token = 'W3Zdt8hHaGxmw7Ll5B2nd9nmQ6A62nOZ/6HhYHIPtAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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