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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcdd23322a1d575c5e2673e7811859ba2f335f021da09c16cc18bea9174f51dd' 
  AND token = '7sKfjDXNZWIwiu7rGuMVnsHu5/Adv0Rm+UbyCjh0wC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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