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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268c8c1d3c17529243c2c06a8654202fa55665d6499bec2e0f8b4e5b62ac9c75' 
  AND token = '0LseqJjvFERKXXrIltAr3WWNL2HNVf69tqz3/5qqBTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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