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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551152e02916b23f9373d61c2edf940b0c359586e27f1c01aed7eb757f44b6e2' 
  AND token = 'NjfKgr5tM79zFwYSCxq5Lfynrz3DbVi2i5h9/u5GFwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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