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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb68815f82767a26ae11ee924977a2839cad663d8b9c29bd75fcc7a80cac5614' 
  AND token = 'fh6of7ksopvUoTkwF94B2Wr/oE4IjaS/F1CAkmzetKs=' 
  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"
    }
  }
}