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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f19787f90b3521398c1977a2b3af4b26ae993e4a0f4da640e8eeea6ae999fe' 
  AND token = '8b6Vj0+WZLc0v7W7hB8OdQy3pruwnO8tfvxKNcnCVE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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