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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad65f37f0624f2cd09a6b05b3c8456cd4e5d7b30f7ba9b64b9782255138a8f4' 
  AND token = 'V406WE0QHEoRna8uHHmPpuEfiMWF3FDMtTgk90osHeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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