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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b96157964d73799917c1b996b7b6e2884ccc6e0ede78d0dff2d17c54660772f' 
  AND token = 'JGwVpiv/pGCypCoYC8ldSd98sLFRk9ULrWiOYkp72pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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