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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5a0d7bac2e0f0e0290c4258b9e5eff4d3e7de454126038065d00cc26e06ab6' 
  AND token = 'JWkT2NHrweQQ7xZWHMRXJ/hfCq/8u8jQ8eGXq63Us1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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