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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2102be42d793efc48a373ef96f54e3b49e284e91f629529b755c9e0d41c069ae' 
  AND token = 'iFW78bx9FKvsuk6fe0n3V829tasUTl0NGp62n2uMHqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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