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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ddcec6ddf9075f653d5dc7109fa11d81d473e2a47bdf7f46532dfc3e3168b8' 
  AND token = '21fRv+n3Z4e7QEDTBgmueefQnd2I8X2HYU4PpYP9ZDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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