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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551634ba6d59a090c1effc3485c8343023a508bcec44e2bd20a8c0df72c9b1ab' 
  AND token = 'qzDCOriWFLZEtMxbzu9jWE7l0wsBdTCJ3LsyTXUxuBE=' 
  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"
    }
  }
}