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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c9fb1daee52ebded093e27968a12fadab32d7281f7f8009e00480d22dd7f77' 
  AND token = 'cGk4Qo1A+04NjbvavZZ7J6OnRBncu1jTiOmv2gf9jXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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