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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2742b2e105893dbb3c0d018c1b4d81e12cc467239f217959ab6f9f19d645c72d' 
  AND token = 'MloELq7ZoRyEquZTI6D5/TVzq9jylpZobom8uzb42ig=' 
  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"
    }
  }
}