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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ce66c613e6ee4397eab7d30737738eb6669624bfb7b8fa87e6ce6ed096ed343' 
  AND token = 'nFJL3oQJik8ki57audLrUIO09FvwnyG0U6nbAjol2ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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