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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35331a6ea2807e9d98670d2e0aced9f42d5bfd9fb368d03655783aeced2a7fd6' 
  AND token = 'X2L6Zm13rwRiP5aSXuck4Fb1k+sXt+/9rRlm91iUpFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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