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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056cb7a2996dcfff821ba3c24f5a9c6662d84f431b0b4e59fafd877ef6d24d5c' 
  AND token = 'eEkYo/ULNBILoR8mNY7YBRNKNvr7+p69LSeBlXFWZjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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