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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9614d5ba1c658400b7f580bcdf29e16450db6b323c1c1cb38071f1adec73b6' 
  AND token = 'c10kBwcwYqn2euMxToa8GdYqB+VHD+5aG4OpamHSLno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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