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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '097a4527482ad28c34244633ea6528a3da651b9e09a2b5c1f8940ba2acaea812' 
  AND token = 'sEXn+KQUD/Tv0fL1nlq0dV5s/WBiMKaqhsfXmLeFFuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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