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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a29523b8d26b5d11a9226362a5a26761c1983a34040b39fa016449c19e0a351e' 
  AND token = 'hLQUZJgliVP2+lOO3h11Sc5x9bHOIC4XNk3ktjBNsQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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