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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b148d3a1b6c6ba0fb06f7b029f6f82bf0b7acefc8dbd52c1240a2e3b1cd76ac' 
  AND token = 'tGtMBClP6yWWZn6bUHELyFZbpdz3beUZW3K80QIpb/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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