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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b1ebb9344380b2dee10fbe58447db1d24e181b9204446e11acd40eb77c5f38' 
  AND token = 'tjFUxkEULrJbLrWuRYSSZMNZ6usJ85G1pC3WWt8SP5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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