SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693f60bdfa5369e21740ae969d12b020b5d26a8c181c179af62b1a79cbfd3ed2' 
  AND token = 'XyHWoCW7qNBM0gBr7TYV/zP5+2Y5y/yPPMpJ4GQxvSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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