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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0405d51810bbc6276f7af26a77de2ae141f1952a5b59e9e7dc2b6c0d967a7be4' 
  AND token = 'giovpbwo65FBMcPUob7NSgr4CXmGPtl6DqwTR4Dlr2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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