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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e61bae34e46d8041b2f237d8aaa54d030c8fd3e876491ab03b887d08d6d692' 
  AND token = 'i9tBe9nihJa/lbNL+zmGYSEqpHsCeCsCKzyxeJl559Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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