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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb4274c1f33ae706288d9ee10028e981a21a3fce81529f9ba0e503d2133d5df' 
  AND token = 'u8ubQA/DrnoyyKCiNmZNf+cEJA1aoeBZ94zJ7Ws+ws8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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