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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c60413b0a7c9d6b238f8d3e33da316991179cf81297977e8d0395830e9006e9' 
  AND token = 'iwaoHnfqePzFDqsYpY5B+sSeYA41Uwsp95EuwsZdZxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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