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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6e4e40f20fd2d311f117201df299ecc17a5171c761eaffbd4902f0217d785e' 
  AND token = '3b8cAIUd6XT3SGDqeOxsKWP+xY5Lp6N2KYW+xEg39+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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