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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd701ee55ee95d197ef4884b1cc64c040f63547fa763664a277c853fc8e071f' 
  AND token = 'FljOxPzbpS5YkXc1qaCHHV0qLoiO4tM1qq3LA4mb6ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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