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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc508269c4c21996ddb185762a6b8fbcf670cc08e447a41bca4f80b65e88893' 
  AND token = 'hNgygz+Lqt2uk0J600qO1KK0d6SmKd7FPN1P+u1rrjs=' 
  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"
    }
  }
}