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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747f0703955ae60175ce6ae042fc3416ab549a1dc7d9eb0971669b40f1430f08' 
  AND token = 'xO3F0asOrGqbP3on3eg9m6a4DoLSz4HyTgANpiNus9M=' 
  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"
    }
  }
}