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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36617a41d9419057ed3871a23926d52512d82e935903a5f9b7252b7b38d27455' 
  AND token = 'D6g+Y5VwaVI2uHSbHdAix7AUFMfBfeu//lGgyUl65ZE=' 
  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"
    }
  }
}